Photoexcitation of astrophysically important states inMg26. II. Ground-state-transition partial widths

Abstract

The level structure of $^{26}\mathrm{Mg}$ near the neutron-separation energy, which is of interest for s-process nucleosynthesis, was studied at the High Intensity Gamma-Ray Source of the Triangle Universities Nuclear Laboratory using the method of nuclear resonance fluorescence. A nearly monoenergetic and linearly polarized $\ensuremath{\gamma}$-ray beam was used to scan the excitation energy range from $10.5$ to $11.7$ MeV. For the five states observed, the total widths and partial widths are determined. Precise measurement of these widths is necessary for the prediction of neutron production for the s-process.